Compression coupling



C. A. HILL COMPRESSION COUPLlNG Amm 2m, 1926. 4 158mg@ Filed Feb. 6, 1922 N 25u/enfer.' r ,g4 A cY/wwe.; dilaga Pefented Apr. zo, 1926.

UNITED STATES `CHARLEB A. HILL, 0F PORTv HUN, MICHIGAN, ASSIGNOR T0 ADOLPH IUELLER,

`'.lRUB'IJIEIE, OF DECATUR, ILLINOIS.

CQMPRESSION COUPLING.

Application ined February 6, 1922. semi- Ne. 534,579.

To all whom t may concern.'

Be it known that CHARLES A. HILL, a citizen of the United States, residing at Port Huron, in the county of St. Clair and State of Michigan, has invented new .and useful Improvements in Compression Couplings, of which the following is a specificatlon.

This invention relates to a coupling for joining the ends of pipes, or for securing the end of a pipe or similar member to any other opposed ittin such as a nipple attached to a tank or t e like. v

More particularly this invention has for its object, the provision of a compression member formed of any suitable ductile metal, such as brass or-copper, which is arranged on the outer periphery ofthe pipe to be coupled, and disposed between the union of the coupling and the coupling nut, so that when the nut is threaded to the union, one at least of the ends of the compression member is brought into contact with a tapered or bevelled shoulder, in one of the coupling members, and is spun inward into biting and locking engagement with the outer periphery of the pipe, thereby providing a iiuid tight joint, which will eectively seal the parts together, and will dispense with the use of fibrous or other special forms of packings now in common use.

A further im roved feature of this invention consists in orming the main bore of the union or fitting, with a recessed portion connected to the main bore by a ta ered or bevelled shoulder, which is prefera ly formed at an angle of about 309 to the horizontal,so that when the end of the pipe is brought into contact with the shoulder, and the arts are drawn together, the end is swagedown into the bore, thus forming an additional lookin and sealing means for the coupling. In tie accom anying drawings, Figure 1 is a longitudina section showing a coupling assembled, but not set up yor tlghtened.

Figure 2 is asimilar view with the cou. pling set up.

Figure 3 is a longitudinal sectional view showlng the recessed union rovided with a tapered or bevelled shoulder, and the coupling assembled but not set up or tightened. v.

Figure 4 is a view similar to Figure 3 with the coupling set up.

Figure 5 is a longitudinal sectional view present instance,

the invention.,

Referring to the drawings, wherein like numerals indicate like parts in the several igures,.10 designates a union or fitting of any sultablev formor type, which in the present disclosure is formed with externally threaded ends 11 and 12, and the hexagonal center nut or portion 13; the nut 13.thus. provldingpmeans for attaching the threaded end 11 to anyA desired structure or tting, such as a gasoline tank or the like.

The interior of the main bore 14 ofthe u nion 10, is provided with a counterbored or enlarged recess, having an abutting shoulder 15, adapted to v receive the inner end. of the member to be coupled, in the the pipe 16. The coupling nut 17, designed to engage the end 12 ,of the union, is provided with a longitudinall threaded'recess 18, the inner end of whic recess 18 terminates in a.tapered or bevelled shoulder 19, formed preferably at about an angle of 30 to the horizontal, although the angle of il. zlination may vary, the purpose of which zvill subsequently be described.

The compression member or ring 20, which may beformed by cutting sections fromv a continuous pipe of any ductile metal, such as brass or copper,`is of such diameter as to permit it to be easily slipped over the end of the pipe 16, andsnugly fit in the space formed etween the outer periphery of the pipe 16, and the threaded portion of the recess 18, in the coupling nut 17. 9()

The outer end ofthe compression ring 20, when the nut 17 is threaded to the union 10, is arranged to abut against theend of the memben 12, while its opposite end, which contacts with the tapered shoulder 19, is subjected to the spinning action of the nut 17 as thelatter is rotated and set up, which causes said end to be distorted and spun inward into biting and lockin engagement with the pipe 16, thus forming 1n the periph- 100 eral wall of said pipe the indentation or of a coupling showing a modified form of groove 21, so as to provide a Huid tight and interlocked connection of the parts, as clearly shown in Figure 2.'

In Figures 3 and 4, wherein are shown a 105 slightly modified form of the invention, the counterbored recessed portion of the union is provided with a tapered or bevelled shoulder 22, formed approximatel at. an angle of 30 to the horizontal, and

so arranged '110 p ling.

In the modified form of the invention shown in Figure 5, the union or fitting 24 has the main bore 24 connected to the counterbored recess 25 by a ta ered shoulder 26. The forward end of t e recess 25 is similarly connected to the threaded portion 27 by a tapered shoulder 28. The inner end of the pipe 29 is arranged to fit in the recess 25, and to contact with the tapered shoulder 26. The coupling nut '30 is formed with an externally threaded stem portion 31, adapted to be secured' to the threaded portion 27' of the union. The compression ring 32, which slidingly :lits the pipe 29, has one end contacting with ,the bevelledslioulder 28, and its opposite end abuttin against the end 3l of the nut 30. Whent e nut 30 is threaded into the union 23, the forward end of the compression member 32 is swaged inward into \biting and locking engagement with the outer wall of the pipe 29, forming the locking groove 33 in the outer periphery of said pipe.

contacting with the tapered shoulder 26, is swaged inward, as shown, thus providing an additional locking means, which renders it practically impossible for the fluid to work past the double seals and escape through the screw threads oi' the coupling nut.

The thickness of the compression ring, and the inclination of thetapered shoulder, formed in either the union or the coupling nut, may be varied depending upon the type Simultaneously, the end 34 of the pipe= of tubing on which the coupling is used. Thusx for instance, where the pipe to be coupled is formed ofvery thin tubing, it would be desirable to lmake the compression ring relatively thick in cross section, and

the taper in the nut or the union of low` pitch or taper, so that the compression vring will bite into and form a secure Joint wit the pipe, yet the strength and resistance of' the compression ring will be such as to lcombination of a union having a bore oi unequal diameters connectedl by a tapered wall, a coupling nut threaded to one end of said union and having a bore with a tapered wall inclined in an opposite direction to the tapered wall of the union, a pipe adapted to engage the tapered wall Iin sald union, and a compression member surrounding said pipe and abuttingthe end of said union, the opposite end of the compression member engaging the tapered wall in said nut, whereby when said union and nut are drawn together the end of the pipe and the opposite end of the compression member will be compressed and tapered .by the oppositely tapering walls or said union and nut.

In testimony whereof I have hereunto set my hand.

. CHARLES A. HILL.

that the' form of 

